Again this does not necessarily mean it'll be a scam but I started to be very cautious if a profile has only professional studio photographs.
I work in the creative arts, and photoshop is VERY powerful, the two or 3 times I went for a girl with studio pics only it was always a slight disappointment. Not all bad experiences, it's just that there is a chance shes 30 percent ish less pretty in real life.
Or has a giant tatoo of a panda bear, that stretches over her entire back -actually happend and it's a bit wired if you got to look at a panda gnawing away on bamboo while taking a girl doggy;)
take this profile for exa=mple https://www.adultwork.com/ViewProfile.asp?UserID=2054264
no feedback no verification pic, no gallery just 3 very hot looking studio pics +120 ph -not for me. I have not seen this girl so maybe, maybe I am wrong, but in my experience nobody looks that perfect.
similar here https://www.adultwork.com/ViewProfile.asp?UserID=1877758
she's got goof feedback and I'm sure she might provide a good service. But dress size 14 and everything on her pics looks like it's a lot less and on an 18 year old. Again I've not seen her but personally I'd find it hard to believe that she'd turn out exactly like her pics in the flesh
Here however https://www.adultwork.com/ViewProfile.asp?UserID=1682137
some professional / semi professional pics mixed with pics where you can tell that they have been taken in a hotel room with a flash. If you like what you see on those chances are you won't be let down when you meet her in the flesh
another thing is, limit your search if you look for girls, the least first thing I do on the search form is check the following,
-dislike bareback -no brainer
-available today -it costs a bit of money to be displayed as available so you know whoever did this cares at least a tiny bit
-logged in within the last week or two weeks -not a 100% but with a bit of common sense you can tell if a girl is actually using her own profile or if it was just set up once and then never used again.
also check the 'accessing from' on the girls profile page. A girl from London should not be accessing from Hungary besides when her profile says she is on holiday and she's hungarian.
all the above are not 100% but with what the others have said and a bit of common sense you should be able to weed out most of the bad ones.